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package uk.ac.rdg.resc.edal.metadata;

import uk.ac.rdg.resc.edal.dataset.GriddedDataset;
import uk.ac.rdg.resc.edal.grid.HorizontalGrid;
import uk.ac.rdg.resc.edal.grid.TimeAxis;
import uk.ac.rdg.resc.edal.grid.VerticalAxis;

/**
 * This is a {@link VariableMetadata} object specialised for discrete 4D grids.
 * This is used to ensure that {@link VariableMetadata} supplied to
 * {@link GriddedDataset}s have gridded domains, but it will not be used to
 * constrain any return types (which are all just {@link VariableMetadata})
 * 
 * @author Guy Griffiths
 */
public class GridVariableMetadata extends DiscreteLayeredVariableMetadata {
    private static final long serialVersionUID = 1L;

    public GridVariableMetadata(Parameter parameter, HorizontalGrid hDomain, VerticalAxis zDomain,
            TimeAxis tDomain, boolean scalar) {
        super(parameter, hDomain, zDomain, tDomain, scalar);
        if (hDomain == null) {
            throw new IllegalArgumentException(
                    "GridVariableMetadata must contain a horizontal domain");
        }
    }

    /**
     * Returns the {@link HorizontalGrid} of the variable.
     */
    @Override
    public HorizontalGrid getHorizontalDomain() {
        return (HorizontalGrid) super.getHorizontalDomain();
    }
}
